1 /* 2 * Copyright 2015 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkPaintFilterCanvas_DEFINED 9 #define SkPaintFilterCanvas_DEFINED 10 11 #include "include/core/SkCanvasVirtualEnforcer.h" 12 #include "include/utils/SkNWayCanvas.h" 13 14 class SkAndroidFrameworkUtils; 15 16 /** \class SkPaintFilterCanvas 17 18 A utility proxy base class for implementing draw/paint filters. 19 */ 20 class SK_API SkPaintFilterCanvas : public SkCanvasVirtualEnforcer<SkNWayCanvas> { 21 public: 22 /** 23 * The new SkPaintFilterCanvas is configured for forwarding to the 24 * specified canvas. Also copies the target canvas matrix and clip bounds. 25 */ 26 SkPaintFilterCanvas(SkCanvas* canvas); 27 28 enum Type { 29 kPicture_Type, 30 }; 31 32 // Forwarded to the wrapped canvas. getBaseLayerSize()33 SkISize getBaseLayerSize() const override { return proxy()->getBaseLayerSize(); } recordingContext()34 GrRecordingContext* recordingContext() override { return proxy()->recordingContext(); } 35 36 protected: 37 /** 38 * Called with the paint that will be used to draw the specified type. 39 * The implementation may modify the paint as they wish. 40 * 41 * The result bool is used to determine whether the draw op is to be 42 * executed (true) or skipped (false). 43 * 44 * Note: The base implementation calls onFilter() for top-level/explicit paints only. 45 * To also filter encapsulated paints (e.g. SkPicture, SkTextBlob), clients may need to 46 * override the relevant methods (i.e. drawPicture, drawTextBlob). 47 */ 48 virtual bool onFilter(SkPaint& paint) const = 0; 49 50 void onDrawPaint(const SkPaint&) override; 51 void onDrawBehind(const SkPaint&) override; 52 void onDrawPoints(PointMode, size_t count, const SkPoint pts[], const SkPaint&) override; 53 void onDrawRect(const SkRect&, const SkPaint&) override; 54 void onDrawRRect(const SkRRect&, const SkPaint&) override; 55 void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override; 56 void onDrawRegion(const SkRegion&, const SkPaint&) override; 57 void onDrawOval(const SkRect&, const SkPaint&) override; 58 void onDrawArc(const SkRect&, SkScalar, SkScalar, bool, const SkPaint&) override; 59 void onDrawPath(const SkPath&, const SkPaint&) override; 60 61 void onDrawImage2(const SkImage*, SkScalar, SkScalar, const SkSamplingOptions&, 62 const SkPaint*) override; 63 void onDrawImageRect2(const SkImage*, const SkRect&, const SkRect&, const SkSamplingOptions&, 64 const SkPaint*, SrcRectConstraint) override; 65 void onDrawImageLattice2(const SkImage*, const Lattice&, const SkRect&, SkFilterMode, 66 const SkPaint*) override; 67 void onDrawAtlas2(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[], int, 68 SkBlendMode, const SkSamplingOptions&, const SkRect*, const SkPaint*) override; 69 70 void onDrawVerticesObject(const SkVertices*, SkBlendMode, const SkPaint&) override; 71 void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4], 72 const SkPoint texCoords[4], SkBlendMode, 73 const SkPaint& paint) override; 74 void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override; 75 void onDrawDrawable(SkDrawable*, const SkMatrix*) override; 76 77 void onDrawGlyphRunList(const SkGlyphRunList&, const SkPaint&) override; 78 void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y, 79 const SkPaint& paint) override; 80 void onDrawAnnotation(const SkRect& rect, const char key[], SkData* value) override; 81 void onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) override; 82 83 void onDrawEdgeAAQuad(const SkRect&, const SkPoint[4], QuadAAFlags, const SkColor4f&, 84 SkBlendMode) override; 85 void onDrawEdgeAAImageSet2(const ImageSetEntry[], int count, const SkPoint[], const SkMatrix[], 86 const SkSamplingOptions&,const SkPaint*, SrcRectConstraint) override; 87 88 // Forwarded to the wrapped canvas. 89 sk_sp<SkSurface> onNewSurface(const SkImageInfo&, const SkSurfaceProps&) override; 90 bool onPeekPixels(SkPixmap* pixmap) override; 91 bool onAccessTopLayerPixels(SkPixmap* pixmap) override; 92 SkImageInfo onImageInfo() const override; 93 bool onGetProps(SkSurfaceProps* props) const override; 94 95 private: 96 class AutoPaintFilter; 97 proxy()98 SkCanvas* proxy() const { SkASSERT(fList.count() == 1); return fList[0]; } 99 internal_private_asPaintFilterCanvas()100 SkPaintFilterCanvas* internal_private_asPaintFilterCanvas() const override { 101 return const_cast<SkPaintFilterCanvas*>(this); 102 } 103 104 friend class SkAndroidFrameworkUtils; 105 }; 106 107 #endif 108